UPDATE #1 - 10/14/14
In latest days, Russia has discovered a huge, in fact, we could say MASSIVE Oil field that, experts said, it could be larger than the Gulf of Mexico.
This reinforce its Oil Supply and therefore, their plans; they planned to sell Oil at $100 a barrel.
The US won't let that to happen.
Suddenly, Middle East producers said that they will be "comfortable selling Oil barrels at $80, or even lower". This is clearly an offensive against Russia's plans, and a precise punch to Russia's economy.
You can be sure that the US is behind this. They could even buy Oil at $100, officialy declaring $80 and paying the other $20 "behind the table".
How do you think Russia's counter-offensive will be?
Trade, don't bet.